A process for the production of copolymer latices

• Main Authors: SINN GUSTAV, MAYER-MADER RUDOLF, DINGES KARL, HORNING HEINZ
• Format: Patent
• Language: English
• Published: 15.11.1967
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A monomer mixture comprising 40 to 70 parts by weight of a conjugated diene, 0.5 to 5 parts of a bicycloheptene derivative containing a carboxyl group and 50 to 15 parts of another monoethylenically unsaturated compound is used for the production of copolymer latices. The preferred dienes are 1,3-butadiene, isoprene and chloroprene and suitable comonomers include (meth)acrylonitrile, methylene glutarodinitrile, ethyl acrylate, n-butyl acrylate, vinyl acetate and styrene. The polymerization may be carried out in aqueous emulsion using conventional emulsifiers, catalysts, regulators and terminators. The latices are used, in conjunction with cross-linking and vulcanizing agents, as binders for non-woven fabrics (see Division D1). In the examples, copolymers of butadiene and bicyclo-[2,2,1]-hept-5-ene-2,3-dicarboxylic acid with acrylonitrile and/or methacrylonitrile, methylene glutarodinitrile, styrene, ethyl acrylate or n-butyl acrylate are produced in an aqueous emulsion containing sodium alkyl sulphonates, a stearyl alcohol-ethylene oxide condensate, an alkyl naphthalene sulphonic acid - formaldehyde condensate, sodium sulphoxylate, t-butyl hydroperoxide, FeSO4, tetrasodium pyrophosphate and t-dodecyl mercaptan, the ingredients being added stepwise and the polymerization being terminated using sodium dithionite, a steary alcohol-ethylene oxide condensate and the sodium salt of ethylene diamine tetraacetic acid. The latices are stabilized and the latex comprising the acrylonitrile terpolymer is mixed with ZnO, melamine resin and NH4Cl and cured.ALSO:Non-woven fabrics or fibrous webs are consolidated by a binder consisting of a latex of a copolymer produced from 40 to 70 parts by weight of a conjugated diene, 0.5 to 5 parts of a bicycloheptene derivative containing a carboxyl group and 50 to 15 parts of another monoethylenically unsaturated compound. The binder may also contain a cross-linking agent and catalyst and a vulcanising agent. The production of suitable latices is described (see Group C3). In an example, non-woven cotton fabric is impregnated with a binder comprising a latex of a terpolymer of butadiene, bicyclo[2,2,1]-hept-5-en-2,3-dicarboxylic acid and acrylonitrile, ZnO, a melamine resin and NH4Cl. The fabric is then squeezed, dried, heated to cross-link the polymer, washed and dried again, calendered and subjected to drycleaning or boiling.